After I don't know what trouble you have, add solving the problem or solving the problem.

Haha, both are ok, but there are two meanings.

I

don't

know

what

trouble

you

have

arrive

solve

this

question

I don't know what trouble you have to solve this problem. It means, why don't you solve the problem? Are you in trouble?

I

don't

know

what

trouble

you

have

(When?

) solution

this

question

I don't know what trouble you have encountered in solving this problem. When to omit